Starlin Castro stands at his locker and takes the heat when things go wrong. He never asks for days off. He won’t let the money or the trade rumors change him.

Castro speaks better English than he did as a rookie, and a $60 million contract has given his family generational wealth. But after all the ups and downs, he still resembles the kid who showed up in the visiting clubhouse at Great American Ball Park on May 7, 2010, and faced the great expectations.

Castro hit a three-run bomb in his first big-league at-bat and put up six RBIs that night in Cincinnati. Three nights later, the young shortstop made three errors and got booed during his Wrigley Field debut.

There have been extremes, getting on the cover of Sports Illustrated, getting ripped by Bobby Valentine on national television and now getting back to the All-Star Game for a third time at age 24.

Castro will sometimes slam his helmet to the ground in frustration or let his mind drift for a moment while playing defense. But he’s remarkably composed for someone who plays a glamour position for an iconic franchise in an overheated media market.

It’s just that Castro’s now a more complete player, already putting up 11 homers and 52 RBIs this season, better numbers than he had all last year.

Alfonso Soriano — the $136 million man who became the godfather to Castro’s son, Starlin Jr. — showed how to keep a cool head and bring the right amount of swagger to the ballpark.

“You know who I learned a lot from — Sori,” Castro said. “Sori’s the same guy. Always. I always hung out with him. And that’s the kind of thing that he told me: Nobody’s better than baseball. When you’re gone, baseball stays. If you’re a star, if you’re a great player, keep the same (attitude). Stay humble.”

Castro spoke with Soriano after the New York Yankees designated him for assignment last week, and it’s unclear if he’ll simply stay home with his family in Tampa, Fla., and retire after a borderline Hall of Fame career.

Like Soriano, Castro always wants to see his name in the lineup, and that gets overlooked when he’s broken down on Twitter and talk radio.

Castro has started all 94 games at shortstop this season. He played 161 last season, even as he struggled to process the organization’s mixed messages, looking lost at the plate (.245 average). He played all 162 in 2012, part of a consecutive-games streak that reached 269. That says more than the coded language used by some scouts and media personalities.

Castro credited Tim Buss, the team’s strength and conditioning coordinator, for traveling to the Dominican Republic during the offseason and designing a program that reshaped his body and his mentality. Castro then worked out at the IMG Academy in Bradenton, Fla., before reporting to spring training.

Castro had something to prove after the Cubs fired manager Dale Sveum, citing the stalled development by young core players like their franchise shortstop and first baseman Anthony Rizzo.

Whatever the perceptions, new manager Rick Renteria put it this way: “I just know from the very first phone call we shared over the winter, (Castro) said he was willing to do whatever it took to get back on track. And he’s done it.”

Castro has survived the regime changes, playing for Lou Piniella and Mike Quade and working with a diverse group of hitting coaches and infield instructors, as well as Theo Epstein’s front office. The consensus: Castro is coachable, eager to please, someone who cares about his craft.

“I don’t know what the media have said about him,” Cubs hitting coach Bill Mueller said. “I came in clean with Rizz and Casty. But from Day 1, both those guys have been hard workers, and they take it very seriously. And that’s all you can ask. They’ve been listening. They apply what you’re saying, and they’ve been going out and doing (it).”

Castro appreciates it more this time. He chartered a plane to fly his family and Rizzo to Minnesota. He will be back where he belongs on Tuesday night at Target Field.

“After that bad year last year, that’s what we’re looking for,” Castro said. “Make the All-Star Game and come back at that level.”

Blue Jays closer Roberto Osuna was arrested in Toronto back on May 8 on charges of assault against a woman and he has been on MLB’s administrative leave list ever since — that leave having been extended twice already.

Canadian authorities aren’t revealing any details about the case so as to protect the identity of the accuser and it’s unclear where MLB’s investigation into the matter stands at this point, but Jon Heyman of FanRag Sports opens his latest column with this note …

Toronto Blue Jays star closer Roberto Osuna’s domestic issue is said by people familiar with the case to be serious and involve allegations of a physical nature, which would draw a significant ban.

Heyman notes that Major League Baseball handed 15-game suspensions to Jeurys Familia and Steven Wright for domestic assault cases where there was no physical abuse — or none proven — and that Aroldis Chapman got 30 games after a police report revealed that he did get physical with the victim and also fired a gun.

It sounds like Osuna could be facing a suspension of at least 20-25 games, given the precedent. Again, though, we don’t have any actual details.

Tyler Clippard has been operating as Toronto’s primary ninth-inning man in Osuna’s absence.